Spin Nernst Effect in the Paramagnetic Regime of An Antiferromagnetic Insulator

ORAL

Abstract

We theoretically investigate a pure spin Hall current driven by a longitudinal temperature gradient, i.e., the spin Nernst effect (SNE), in a paramagnetic state of a collinear antiferromagnetic insulator with the Dzyaloshinskii-Moriya interaction. The SNE in a magnetic ordered state in such an insulator was proposed by Cheng et al. [R. Cheng, S. Okamoto, and D. Xiao, Phys. Rev. Lett. 117, 217202 (2016)]. Here we show that the Dzyaloshinskii-Moriya interaction can generate a pure spin Hall current even without magnetic ordering. By using a Schwinger boson mean-field theory, we calculate the temperature dependence of SNE in a disordered phase. We also discuss the implication of our results to experimental realizations.

*Department of Energy, Basic Energy Sciences, Grant No.DE-SC0012509. S.O. acknowledges support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Yinhan Zhang

    • Carnegie Mellon University

Authors

  • Yinhan Zhang

    • Carnegie Mellon University

  • Satoshi Okamoto

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Materials Sciences and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Di Xiao

    • Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
    • Carnegie Mellon University
    • Carnegie Mellon Univ
    • Department of Physics, Carnegie Mellon University